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Math Help - Field strength

  1. #1
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    Field strength

    Two charges of +4.0x10^-6 C and +8.0x10^-6C are placed 2.0m apart. What is the field strength halfway between them?

    = (9.0x10^9)(4.0x10^-6C) + (9.0x10^9)(8.0x10^-6C)
    (2m)^2 (2m)^2

    This is what I have...which part is wrong?
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by johett View Post
    Two charges of +4.0x10^-6 C and +8.0x10^-6C are placed 2.0m apart. What is the field strength halfway between them?

    = (9.0x10^9)(4.0x10^-6C) + (9.0x10^9)(8.0x10^-6C)
    (2m)^2 (2m)^2

    This is what I have...which part is wrong?
    They are 2m apart, so the point midway between them is 1m from each, and where are the 4 \pi \varepsilon_0 terms?

    RonL
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  3. #3
    Grand Panjandrum
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    Quote Originally Posted by johett View Post
    Two charges of +4.0x10^-6 C and +8.0x10^-6C are placed 2.0m apart. What is the field strength halfway between them?

    = (9.0x10^9)(4.0x10^-6C) + (9.0x10^9)(8.0x10^-6C)
    (2m)^2 (2m)^2

    This is what I have...which part is wrong?
    and the two terms are in opposite directions so one of them should have a "-"
    sign in front of it.

    RonL
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